What Changed After Young Athletes Tested CoreFlex

The first version of CoreFlex was not the final version.

Neither was the second.

That was the point.

We built Eyrx around a simple process: try something, listen carefully, adjust what is not working and come back better.

So when early CoreFlex samples were ready, we put them in front of real young athletes and parents and paid attention to what happened next.

Not just what they said.

What they adjusted. What they noticed. What they wanted changed. And which details actually made the product better once they started moving.

Testing was part of the design process

Product development can look neat when it is summarized after the fact.

In reality, it is a series of decisions, corrections and small improvements.

A fabric can look right and still feel wrong.

A fit can work while an athlete is standing still and fail as soon as they start running, squatting or changing direction.

A design can feel complete until a parent points out something obvious that everyone else missed.

That is why feedback was never treated as a final checkpoint. It was part of the process from the beginning.

The fabric had to feel better and still perform

Performance fabrics are usually described by what they do.

Stretch. Moisture management. Odor resistance. Sun protection.

Young athletes tend to evaluate them more simply:

Does it feel good enough that I want to wear it again?

That question mattered.

We wanted CoreFlex to feel soft and comfortable while still providing the four-way stretch and performance needed for running, jumping, climbing and changing direction.

The goal was never softness instead of performance.

It was both.

That same philosophy is part of the Drawer Test : the real proof comes when the athlete has choices and reaches for the same pair again.

The girls’ short needed its own solution

One of the clearest lessons came from the girls’ product.

The girls’ CoreFlex short was not meant to be a boys’ product with a different color.

Its fit, proportions, coverage and construction needed to work for the athletes who would actually wear it.

Feedback from girls and parents helped shape that process, including the decision to add a built-in inner short for additional coverage and comfort.

That feature was not there because it sounded good on a specification list.

It was there because real users told us it would make the product better.

You can see more of that thinking in our guide to fit and length in girls’ athletic shorts .

What athletes do matters more than what a sample looks like

A product can look polished in a studio and still fail in real life.

Young athletes run, climb, sit on the floor, slide across courts, pile into back seats, forget what is in their sports bag and turn almost any open space into a competition.

That behavior is not a distraction from the product test.

It is the product test.

The product has to work while they are moving, not just while someone is evaluating it on a hanger or in a photograph.

Small problems matter when they happen repeatedly

Product testing is often about noticing the things that become annoying only after repeated use.

A waistband that shifts.

A pocket that is not quite deep enough.

A fabric that feels good for ten minutes but not for the rest of the day.

A fit that looks right but restricts movement.

Those details can seem minor in isolation.

But when an athlete encounters them over and over, they determine whether the product stays in the rotation.

Feedback helped turn features into solutions

CoreFlex eventually came together around features that solved specific problems rather than simply making the product sound more technical.

Four-way stretch supports movement.

Soft performance fabric improves comfort through long days.

Functional pockets and secure storage make the shorts more useful in real life.

UPF 50+, odor resistance and reflective details extend the usefulness of the garment across different environments and schedules.

For a broader look at those decisions, read what features matter most in youth athletic shorts .

Better does not happen all at once

One of the things we want young athletes to understand is that improvement rarely happens in a straight line.

The same is true when you are building something.

You try.

You listen.

You adjust.

You come back better.

That is one reason Rise Again means something inside Eyrx too.

It is not just a message printed around the brand. It is a standard for how we approach the work.

The goal was never to get the first version right

The goal was to keep improving until the product felt right for the young athletes wearing it.

Every round of testing moved CoreFlex closer to that standard.

A premium performance short built around how youth athletes actually move, feel and live.

Not perfect on the first try.

Better because we kept listening.